Connection Timeout Expired. The timeout period elapsed while attempting to consume the pre-login handshake acknowledgement.

Question

Hi Team

I´m facing a problem without solution

Connection Timeout Expired. The timeout period elapsed while attempting to consume the pre-login handshake acknowledgement. This could be because the pre-login handshake failed or the server was unable to respond back in time. The duration spent while attempting to connect to this server was - [Pre-Login] initialization=543; handshake=29466; (.Net SqlClient Data Provider)

I tried all steps here
https://support.microsoft.com/en-us/sbs/topic/solving-connectivity-errors-to-sql-server-ae23c94b-b64b-5056-8b62-22e1694bb889?ui=en-US&rs=en-US&ad=US

Without a solution. It says in some part that on previous link that

I Tested, Network, Firewall, SSL (Using open ssl commands) and everything looks good.

I tested for example
Ping
Telnet
Test-NetConnection

Answer 1

Hi @Marcelo Mota Manhães Thanks for getting back
This may be due to many reasons. Please check the below steps to make sure you are not missing anything.

1. Make sure that TCP/IP is enabled as a client protocol on the application server. For more information, see Configure client protocols. On application servers where you don't have SQL tools installed, verify that TCP/IP is enabled by running cliconfg.exe (SQL Server Client Network utility).
2. Check the application's connection string to make sure it's configured correctly. For example, make sure that the connection string specifies the correct port (1433) and fully qualified server name. See Get connection information. Looks like you checked that already
3. Test the connectivity between the application server and the Azure SQL Database by using SQL Server management Studio (SSMS), a UDL file, ping, or telnet. For more information, see Troubleshooting connectivity issues and Diagnostics for connectivity issues. (You also did that )

Please do also check the below document if you are not missing any steps.
https://learn.microsoft.com/en-us/azure/azure-sql/database/troubleshoot-common-connectivity-issues#diagnostics

If you are still having issues. I will suggest to open a support request so we can get a closer look at your environment to better troubleshoot this.

Regards,
Oury

Answer 2

Thank you Very Much Oury for your inputs, the issue was solved, Basically I did all steps you recommended with success. However the problem was related to internal VPN configuration as I had some missing certificates on TLS handshake process in windows level. After VPN configuration refactory it worked.

Answer 3

Olá, eu estou enfrentando esse erro ao tentar conectar o SQL Server no Power B.I

Detalhes: "Microsoft SQL: Connection Timeout Expired. The timeout period elapsed while attempting to consume the pre-login handshake acknowledgement. This could be because the pre-login handshake failed or the server was unable to respond back in time. The duration spent while attempting to connect to this server was - [Pre-Login] initialization=22737; handshake=14090; "

Alguém poderia me ajudar?